The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 16, 1980
Filed:
Mar. 28, 1978
Ichiro Ohhinata, Yokohama, JP;
Hitachi, Ltd., , JP;
Abstract
A trigger circuit for a thyristor comprising at least one of each of an NPN transistor and a PNP transistor and a PNPN switch to trigger a 4-terminal thyristor by feeding a collector current of the PNP transistor into a cathode gate of the thyristor and by taking out a collector current of the NPN transistor from an anode gate of the thyristor. An emitter of the PNP transistor is connected to a power supply through a resistor, and a cathode and an anode of the PNPN switch is connected to a base of the PNP transistor and a base of the NPN transistor, respectively. By controlling the on-off operation of the PNPN switch, the thyristor is selectively triggered, so that the trigger circuit can be operated by a single low voltage supply and does not require any separate circuit for holding a conducting state of the thyristor.